Telepicture translating mechanism



NOV. 23, 1937. w G FINCH 2,100,161

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Patented Nov. 23, 1937 UNITED STATES PATENT OFFICE Original application February 26, 1936, Serial No. 65,869, now Patent No. 2,047,863, dated July 14, 1937. Divided and this application June 1, 1936, Serial No. 82,713

Claims.

This invention relates to telepicture translating mechanisms and more particularly relates to novel arrangements for the signal lamp and lens system of a telepicture receiver and is a division 6 of my co-pending application Serial No. 65,869,

filed February 26, 1936, which matured into Patent No. 2,047,863 on July 14, 1936.

In the telepicture system disclosed in the parent application of which the present application is a division, the scanning mechanism comprising the light beam is mounted upon a carriage which is moved at a predetermined rate parallel to a rotating drum containing the record sheet. It is an object of my present invention to provide a novel, simple and compact arrangement for focusing the signal light beam which varies in intensity in accordance with received telepicture signals, upon the record sheet. Another object of my invention is to provide novel arrangement for focusing the signal light beam upon the record sheet which is readily adjustable. A further object of my invention is to provide a signal lamp mounting which is readily removable for replacing the signal lamp.

These and other objects ofmy present invention will become apparent'in the following description taken in connection with the drawings, in which:

Figure 1 is a plan view of a preferred embodiment for a telepicture receiver.

Figure 2 is a cross-sectional view taken along 2-2 of Figure 1 through the translating mechamsm.

Figure 3 is a cross-sectional view taken along 33 of Figure 2.

Figures 4 and 5 are cross-sectional views taken through Figure 2 illustrating details of the adjusting mechanism.

The telepicture receiver illustrated in Figure 1 is mounted on a cast iron base l0. However, although a stationary telepicture apparatus is illustrated, my present invention may be equally well adapted to a portable unit. The motor II is connected to electrical power lines 12. Motor I l is preferably of the synchronous type so as to maintain a predetermined speed of operation for the apparatus. Shaft 13 of motor II is mechanically coupled to shaft I4 by flexible coupling l5. Shaft l 4 is joumalled in the housing I 6. A worm and worm gear within housing 16 (not shown) supplies a positive driving connection from the motor to the positive or over-running clutch l1. When the over-running clutch I1 is engaged, the picture drum I8 is rotated by motor H in a positive driving relation. Drum 18 is rotatably supported at its right end by pointed spindle 20 which is part of the tail stock 2|. Details of the clutch l1 and the arrangements for maintaining drum [8 in phase synchronism with the corresponding transmitter are described in the parent case hereinabove referred to.

A plurality of sheet clamping members 22 are longitudinally disposed along a segment of the drum for securing a record sheet or film 23 upon the outer surface of the drum 18. Details of the film clamping members 22 are shown and described in my Patent N0. ,0 9, O July 23) 1936. Presser rollers 24 are manually operable to press against the record sheet 23 while it is being clamped into position upon the drum to facilitate smooth mounting thereof.

Carriage 25 containing the signal light beam rides on V-rollers 26 guided by co-acting V- tracks 21 parallel along drum l8. Carriage 25 is connected to suitable telepicture electrical receiving apparatus (notshown) by cable 28. Carriage 25 is driven at a predetermined rate with respect to the speed of rotation of drum 18 in the following manner:A pinion 30 is connected to one end of a shaft communicating with the drum I8 drive. Reduction gearing 3| affords a driving connection for gear 32 from pinion 30 at a predetermined reduced speed ratio. Worm 33 journalled in bearings 34 and 35 is driven by gear 32. A worm lock secured beneath extension plate 36 of carriage 2-5 and operated by cam lever 31, is engageable with the worm 33. Carriage 25 is accordingly motivated parallel to rotating drum l8 at a predetermined rate. For example, if drum l8 revolves at one hundred revolutions per minute and a scanning detail of one hundred lines per inch is required, carriage 25 is designed to move at the rate of one inch per minute or .01 inch per revolution of the drum [8.

Referring to Figure 2 which is a cross-sectional View illustrating the details of a preferred translating mechanism signal lamp 40 is adjustably mounted vertically projecting through an opening 4| in the cover plate 42 in the carriage 25. Lamp 40 may, for example, be a neon crater lamp such as disclosed in the parent case.

Signal lamp 40 is supported in cylindrical casing 43 and is mounted thereon in an inverted position in order that the signal light beam 44 emanating from the lamp 40 may be directed upon a reflecting prism 45 mounted upon an upright 46 within the carriage. Casing 43 is slidable within sleeve 41 attached to the top of the optical box 48. Sleeve 41 is slotted at 41'. Signal lamp casing 43 is supported in sleeve 41, there being a tight more durable and more efficient than a plane? The vertical beam 44 is ac.-

mirrored surface. cordingly horizontally projected towards the record sheet 23 through the focusing le'nssystem Lens system 5! shown in elevation isdesigned to sharply focus the signal beam 50 upon a point of the record sheet 23. The diameter of the beam 50 from lens system 5|, in the present embodiment, is made .01 of an inch in order that the edges of the scanning line upon record sheet 23 may be contiguous, since one hundred lines are scanned'per inch. The record sheet 23 may be a positive film such as bromide paper or a negative film to translate the impinging light beam into a corresponding positive or negative record of the picture being transmitted.

The lens system 5| is adjustably supported in bearing members 52 which are attached to channelled member 53 by screw 54. Figure 3 is a plan view of the lens system 5| supported in bearing members 52 illustrating the relative position of the reflecting prism 45 and the lens system 5|.

The position of the housing of lens system 5| is adjustable in its supporting members 52. Supporting members52 contain a slot 55 which is traversed by a screw 55 as illustrated in Figures 4 and 5. By looseninglthe screw 56 of the supports .52, lens system 5! may be readily adjustable in its horizontal position with respect to prism 45. It is necessary to adjust the horizontal position of lens system 5| with respect to the prism 45 only when overhauling the apparatus since, for a given design, this distance is maintained at its optimum.

Adjustment of the translating mechanism contained in carriage 25 is generally necessary prior to the reception on this type of record sheets. The distance of the lens box 48 as a whole with respect to film 23 depends upon the thickness of the particular film used. A micrometer adjustment effected by thumb-screw 60 of the position of lens box 48 is provided. The position of carriage 25 with respect to the drum i8 is fixed. However, the position of lens box 48 is adjustable within carriage 25 in the following manner.

Referring to Figure 4, the base of optical box 48 comprises a member 53 co-acting with a bed plate 61 secured to the bottom 52 of carriage 25 by screw members 83. The projection of channelled member 53 is designed to have a slideable fitting relation with bed plate 6| so as to avoid relative transverse movement thereto. A shim B4 is provided at one side of the co-acting edges of channel member 53 and plate 5| to prevent loose co-action of these members.

A screw 55 acting upon a corresponding treated portion of the member 53 is rigidly connected to thumb-screw 55 by set screw 55. A recess 61 within the channel 53 permits the end portion or screw member 55 to project therein. Rotation of thumb-screw 65 will accordingly change the relative position of screw 65 with respect to the member 53. Since the position of screw 65 isjpredetermined and set into carriage 25, and since lens box 4Bis slideable upon bedplatefi I attached to the carriage 25, lens box 48 is movable by operation of thumb-screw 55 as will be understood by those skilled in the art.

Sleeve 47 supporting signal lamp 45 is movable within the opening 4| in the cover plate 42 of the carriage 25, permitting the movement of the optical box 48 within carriage 25. The forward end of lens system 5| projects through a corresponding opening in carriage 25 also. Micrometer adjustment of the translating mechanism attached to lens box 48, with respect to record sheet 23 is-accordingly provided.

An advantage of the novel mounting for the signal lamp 4i) resides in its ready removal for replacement. Signal lamp 45 which may have a useful life period of 1000 hours, for example, may be replaced by merely slipping out its tubular casing 43 from the tightly supporting sleeve 47 and disassembling the lamp 45 from its base and connections within the sleeve 43. The new lamp inserted in position within casing 43 is then readily adjusted to a suitable vertical position with respect to reflecting prism 45.

Although I have described a preferred embodiment for the translating system of a telepicture receiver, it will be evident to those skilled in the art that modifications may be made which fall within the broader spirit and scope of my invention, and accordingly I do not intend to be limited except as set forth in the following claims.

, I claim:

1. In a telepicture receiver having a movable carriage and a signal lamp for generating a light beam in accordance with received electrical signals, a tubular casing for holding said lamp in an inverted position; an optical box within said carriage, a sleeve extending from said box for slidably securing said lamp casing extending through an opening in said carriage; means for deflecting said light beam mounted'within said optical box; a lens system for focusing said deflected beam, adjustably mounted in said box and projecting through openings in said box and said carriage and means for adjusting the position of the optical box and signal lamp with respect to said carriage.

2. In a telepicture receiver having a movabl carriage and a signal lamp for generating a light beam in accordance with received electrical signals, a tubular casing for holding said lamp in a vertical and inverted position; an optical box within said carriage, a sleeve extending from said box for slidably securing said lamp casing exsaid box and projecting through openings in said box and said carriage; and means for adjusting the position of the optical box and signal lamp with respect to said carriage comprising a screw member engaging said optical box and projecting through said carriage. 1 r

3. In a telepicture receiver having a movable carriage and a signal lamp for generating a light beam in accordance with received electrical signals, a tubular casing for holding said lamp in a vertical and inverted position; an optical box withinsaid carriage, a sleeve extending from said box for slidably securingv said lamp casing extending through an opening in said carriage, said sleeve being slotted; means for deflecting said light beam mounted within said optical box; a lens system for focusing said deflecting beam adjustably mounted in said box and, projecting through openings in said box and said carriage; and means for adjusting the position of the optical box and a signal lamp with respect to said carriage comprising a screw member engaging said optical box and projecting through said carriage.

4. In a telepicture receiver having a rotatable drum for mounting a record sheet, a carriage movable longitudinal of said drum and a signal lamp for generating a light beam in accordance with received electrical signals; a tubular casing for holding said lamp; an optical box within said carriage; a sleeve extending from said box for slidably securing said lamp casing exten'ding through an opening in said carriage, said sleeve being slotted; means for deflecting said light beam mounted within said optical box; a lens system for focusing said deflected beam upon the record sheet; and means for adjusting the position of the optical box and signal lamp with respect to said drum.

5. In a telepicture receiver having a rotatable drum for mounting a record sheet, a carriage movable longitudinal of said drum and a signal lamp for generating a light beam in accordance with received electrical signals; an optical box within said carriage having a member projecting through an opening in said carriage for carrying said signal lamp outside said carriage for being externally adjustable with respect to said optical box; a lens system for focusing said beam upon the record sheet adjustably mounted in said box and projecting through openings in said box and said carriage towards said drum; and means for adjusting the position of the optical box and signal lamp with respect to said drum.

WILLIAM G. H. FINCH. 

